Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bb9237ec6e51ed…

MALICIOUS

PDF

84.8 KB Created: 2021-03-27 16:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 37fdf4eb7b326c7aee10f3ddea45e6b8 SHA-1: e7951562a765c67e8f17c67362eb0429bb1e8258 SHA-256: 20bb9237ec6e51eda30b7a566cc1f0dad31b8d9bbb449922992384ab1cc68311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=el+talmud+babilonico PDF link annotation
    • http://frukt.fun/nhl_21_ps4_gameplaygf5s7.pdfIn PDF document text
    • http://inertbhjbj.ru/wolfgang_puck_pressure_oven_recipesrff5g.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/jihgcbg/vubenogabuxedemumopukofu.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/hg7fzia/59717104750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fd9288b9365e.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/x5hjYhe/country_music_singers_on_walker_texas_ranger.pdfIn PDF document text
    • http://7lessons.space/55909698051fxtc7.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/global_warming_and_greenhouse_gases.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/how_to_remove_bonaire_evaporative_cooler_pads.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/49724903600.pdfIn PDF document text
    • http://mainsale.pro/birthday_card_template_word_20075wmoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6033adf59ff8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff6aeda1fd52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_3a1b423cb79f4da5b55def960af95bf0.pdf?index=trueIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_36d5099eee7e40199a8b34e26082ae5a.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_38ae51113dd04e1fb32baca107dd4a30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/ios_11._4._1_beta_1_profile.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/fakutawaga.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/los_seores_del_narco_descarga.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/53178591190.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_629e071c30904baa937ab6a6b28e25bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/how_to_cook_vegetables_in_aroma_rice_cooker.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 4908 bytes
SHA-256: ec1364297fca99565cf6565bde2c25de6481fa171cc0119bc2dfa39b9253a2b3
font_01_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 13852 bytes
SHA-256: 48a3b99d0711ac086041d961e0627e9be9362618dde5705a93654de0ddd9d0ab

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